Astringency and Bitterness Perception
Public ClinicalTrials.gov record NCT03171402. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
Astringency and Bitterness Perception Among High and Low Fruit and Vegetable Consumers
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
The investigators are conducting a study to better understand how the average consumer differentiates between bitter and astringent sensations, both of which are typically unpleasant sensations characteristic of some healthy foods. Astringency is the dry/rough sensation elicited by foods such as green bananas and some wines. Although trained scientists can differentiate between these stimuli, untrained participants rate them similarly, despite their differences. This confusion has created additional barriers in understanding the mechanism of astringent perception, which is currently debated. Understanding how to design experiments where untrained participants can clearly evaluate both sensations will lay the foundation to better understand astringency. One mechanism that is believed to contribute to astringency is the interaction of astringent stimuli with salivary proteins. Interestingly, the salivary protein profile may be influenced by consumption of fruits and vegetables. Therefore, the investigators will evaluate how bitter and astringent perceptions differ among high and low consumers of fruits and vegetables by collecting saliva following exposure to the stimuli. This knowledge will inform approaches to increase the appeal of healthy food.
Study identification
- NCT ID
- NCT03171402
- Recruitment status
- Completed
- Study type
- Observational
- Phase
- Not listed
- Enrollment
- 92 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 18 Years to 45 Years
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Apr 29, 2017
- Primary completion
- May 29, 2018
- Completion
- May 29, 2018
- Last update posted
- Aug 27, 2018
2017 – 2018
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Purdue University | West Lafayette | Indiana | 47907 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT03171402, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Aug 27, 2018 · Synced Sep 2, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT03171402 live on ClinicalTrials.gov.